This page lists 16 engine parts for the 1973 MG MGB, across 12 part types, covering both the 1.8L L4 and the 3.5L V8. Every part shows its brand, manufacturer part number and fitment notes.
The engine on the 1973 MG MGB covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. The largest groups are Crankshaft Seal (2 parts), Cylinder Head Gasket (2 parts) and Timing Belt Pulley (2 parts). The other 9 part types cover the remaining 10 parts.
The 1973 MG MGB was sold with both the 1.8L L4 and the 3.5L V8. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
3 brands supply engine parts for the 1973 MG MGB, led by AJUSA (12 parts), KING ENGINE BEARINGS (2 parts) and BECK/ARNLEY (2 parts).
Each part number listed for the 1973 MG MGB opens a page with every vehicle that part fits.
Camshaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 93099200 | 🇺🇸 US | Engine # 15G | View on Amazon |
This table covers the camshafts that open the valves.
One part is listed for the 1973 MG MGB — AJUSA 93099200.
Connecting Rod Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KING ENGINE BEARINGS Fits: 3.5L V8 | CR811SI | 🇺🇸 US | BI-Metal (aluminum silicon base)Set | View on Amazon |
This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
One part is listed for the 1973 MG MGB — KING ENGINE BEARINGS CR811SI.
Conversion / Lower Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 54043200 | 🇺🇸 US | View on Amazon |
This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
One part is listed for the 1973 MG MGB — AJUSA 54043200.
Crankshaft Main Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KING ENGINE BEARINGS Fits: 3.5L V8 | MB589AM | 🇺🇸 US | BI-Metal (aluminum base)Set | View on Amazon |
This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
This group shows a single part: KING ENGINE BEARINGS MB589AM.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 15024400 | 🇺🇸 US | Front48.5 x 63.5 x 9 | View on Amazon |
| AJUSA Fits: 3.5L V8 | 15036800 | 🇺🇸 US | Rear82 x 98.5 x 12 | View on Amazon |
This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
2 Crankshaft Seal parts for the 1973 MG MGB come from AJUSA.
This group includes AJUSA 15024400 and AJUSA 15036800.
Cylinder Head Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 10045200 | 🇺🇸 US | Multi Layered Steel | View on Amazon |
| AJUSA Fits: 3.5L V8 | 52332300 | 🇺🇸 US | Fits Right | View on Amazon |
This table covers the head gaskets that seal the block to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
AJUSA supplies both parts for the 1973 MG MGB.
This group includes AJUSA 10045200 and AJUSA 52332300.
Cylinder Head Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 52077100 | 🇺🇸 US | Complete Set | View on Amazon |
This table covers multi-piece gasket sets for a cylinder-head job. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
One part is listed for the 1973 MG MGB — AJUSA 52077100.
Engine Kit Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 50087800 | 🇺🇸 US | Multi Layered Steel | View on Amazon |
This table covers full gasket kits covering the joints opened in an engine rebuild. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
One part is listed for the 1973 MG MGB — AJUSA 50087800.
Timing Belt Pulley
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: 3.5L V8 | 0513860 | 🇺🇸 US | Bearing Only | View on Amazon |
| BECK/ARNLEY Fits: 3.5L V8 | 0513954 | 🇺🇸 US | Bearing Only | View on Amazon |
This table covers the Timing Belt pulleys. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt.
2 Timing Belt Pulley parts for the 1973 MG MGB come from BECK/ARNLEY.
Listed part numbers: BECK/ARNLEY 0513860 and BECK/ARNLEY 0513954.
Valve Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 11010600 | 🇺🇸 US | Multi Layered Steel | View on Amazon |
This table covers the gaskets that seal the valve cover to the cylinder head. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
This group shows a single part: AJUSA 11010600.
Valve Lifter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 85002600 | 🇺🇸 US | View on Amazon |
This table covers the lifters / tappets that transfer cam motion to the valves.
This group shows a single part: AJUSA 85002600.
Valve Stem Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AJUSA Fits: 3.5L V8 | 24001900 | 🇺🇸 US | 7 x 18 x 1.5 | View on Amazon |
| AJUSA Fits: 3.5L V8 | 57063700 | 🇺🇸 US | View on Amazon |
This table covers the seals on each valve stem that control oil into the guides. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
2 Valve Stem Seal parts for the 1973 MG MGB come from AJUSA.
Part numbers include AJUSA 24001900 and AJUSA 57063700.
Buying Engine Parts for a 1973 MG MGB
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Match the engine first. Every engine part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Crankshaft Seal and Cylinder Head Gasket .
Frequently Asked Questions
How many engine parts fit the 1973 MG MGB?
Our catalog currently lists 16 engine parts for the 1973 MG MGB across 12 subcategories and 3 brands, covering both the 1.8L L4 and the 3.5L V8. Each part is matched to the engine(s) it fits.
Do engine parts differ between 1973 MG MGB engines?
Yes. Every engine part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of engine problems on a 1973 MG MGB?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1973 MG MGB was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1973 MG MGB?
First match the engine — each row shows which engine(s) the part fits. Then engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1973 MG MGB
Engine Parts for Other MG MGB Years
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